The phrase "puts on one card" usually implies a reckless decision or action made with a total lack of prudence. Antonyms of this phrase could pertain to thoughtfulness, cautiousness, and indulging in wise decision-making. Examples of these antonyms could be taking a measured approach, considering multiple perspectives or alternatives, and hedging one's bets for uncertain outcomes. Alternatively, practicing restraint, being judicious, and practicing discernment would also be viable antonyms for "puts on one card." Ultimately, the antonyms of "puts on one card" all have to do with careful consideration, thoughtfulness, and purposeful decision-making, which is the antithesis of gambling everything on a single outcome.